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Diffusive wave spectroscopy of a random close packing of spheres

European Physical Journal E, ISSN: 1292-8941, Vol: 23, Issue: 2, Page: 145-152
2007
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Article Description

We are interested in the propagation of light in a random packing of dielectric spheres within the geometrical optics approximation. Numerical simulations are performed using a ray tracing algorithm. The effective refractive indexes and the transport mean free path are computed for different refractive indexes of spheres and intersticial media. The variations of the optical path length under small deformations of the spheres assembly are also computed and compared to the results of Diffusive Wave Spectroscopy experiments. Finally, we propose a measure of the transport mean free path and a Diffusive Wave Spectroscopy experiment on a packing of glass spheres. The results of those experiments agree with the predictions of this ray tracing approach. © 2007 EDP Sciences/Società Italiana di Fisica/Springer-Verlag.

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